NOAA Weather Radio All Hazards transmitters broadcast on one of seven VHF frequencies from 162.400 MHz to 162.550 MHz.

Receivers can be found at many retail outlets, including electronics, department, sporting goods, and boat and marine accessory stores and their catalogs.

Most warnings and watches broadcast over NOAA Weather Radio are county- or independent city-based (parish-based in Louisiana), although in a few areas of the country the alerts are issued for portions of counties.

(D) a conventional portable radioreceiver comprising control and sound-emission means, said radioreceiver being stably seated within the said opposed indented portions of said base-sides, and the radioreceiver control and sound-emission means being positioned in registry with said base portion window means.

However, some miniature radios lack such elements "E" and "F" (instead being internally provided with batteries), and such battery powered radios are deemed equivalent to "PR" for the purposes of the present invention.

It is the general objective of the present invention to incorporate a conventional prior art portable radioreceiver (e.g.

The two main requirements of any radioreceiver are that it should be able to separate one station from another, i.e.

These all use the fact that the limiting factor of the sensitivity of a radioreceiver is not the level of amplification available, but the levels of noise that are present, whether they are generated within the radioreceiver or outside it.

Normally radioreceivers are designed such that the internally generated noise is much lower than any received noise, even for the quietest locations.

A radio wave acts as a carrier of information-bearing signals; the information may be encoded directly on the wave by periodically interrupting its transmission (as in dot-and-dash telegraphy) or impressed on it by a process called modulation.

In both radio and television receivers, once the basic signals have been separated from the carrier wave they are fed to a loudspeaker or a display device (usually a cathode-ray tube), where they are converted into sound and visual images, respectively.

Radio is based on the studies of James Clerk Maxwell, who developed the mathematical theory of electromagnetic waves, and Heinrich Hertz, who devised an apparatus for generating and detecting them.

Radio can be incredibly simple, and around the turn of the century this simplicity made early experimentation possible for just about anyone.

A typical baby monitor, with the receiver on the left and the transmitter on the right: The transmitter sits in the baby's room and is essentially a mini "radio station." The parents carry the receiver around the house to listen to the baby.

FM radio signals are operating in the range of 100,000,000 hertz, so 101.5 on the FM dial is a transmitter generating a sine wave at 101,500,000 cycles per second.

A radioreceiver is a real world example of a receiver in the information theoretic sense.

The receiver is generally the nerve centre of a sophisticated home-theatre system providing selectable inputs for a number of different audio components like turntables, compact-disc players, and tape decks and video components like video-cassette recorders, DVD players, video-game systems, and televisions.

Self-powered radios, such as clockwork radios are used in developing nations or as part of an emergency preparedness kit.

en.wikipedia.org /wiki/Radio_receiver (462 words)

Compare Prices and Read Reviews on Sony DRN-XM01C Satellite Radio Receiver with Car Kit at Epinions.com(Site not responding. Last check: 2007-10-29)

XM Radio offers thirty channels which are commercial free while Sirius Satellite Radio claims to be "completely" commercial free (the latter's, 60 music channels; not claimed for their 40 channels of entertainment, news and sports).

XM Radio charges a monthly subscription fee of (nominally) ten dollars; the cost for Sirius Satellite Radio is thirteen dollars a month.

XM Radio is right for me. I've not listened to "free" broadcast radio since I bought my Sony XM Receiver and I watch far less television (it's hard to leave satellite radio when the music is so good).

Variable capacitors are used with inductor coils in tuning circuits of radios, television sets, and a number of other devices that must isolate electromagnetic radiation of selected frequencies.

Transmitted radio waves cause an induced current to flow in the antenna through the primary inductor coil of the transformer to ground.

This radio circuit therefore, is tuned by adjusting the capacitance of the variable capacitor to equalize the inductive and capacitive reactance for the desired resonant frequency, or in other words, to tune in the desired radio frequency.

It is a complete electronic tutorial ranging from the very basics of radio design to the more sophisticated configurations used in short wave radio, ham radio or hobby electronics as a general purpose radioreceiver.

A superhetrodyne receiver works on the principle the receiver has a local oscillator called a variable frequency oscillator or V.F.O. This is a bit like having a little transmitter located within the receiver.

radio where the received signal is in the range 540 Khz to 1650 Khz the v.f.o.

Crystal radio was invented by a long, vague chain of discoveries in the late 1800's that culminated into the first practical kind of radioreceiver in the early 1900's; and constitutes the origin of the field of electronics.

While there were a number of earlier experiments with radio broadcasts to the general public, most historians consider the Autumn of 1920 to be the beginning of radio broadcasting for entertainment purposes.

The crystal radio did not require batteries, but it did require the user to purchase a commercially made set of headphones (or telephone receivers as they were called in those days), since that accessory was not suitable for home construction.

In the Direct conversion receiver the signals from the aerial pass through a band pass filter, and an amplifier before reaching a non-linear mixer where they are mixed with a signal from a local oscillator which is tuned to the carrier wave frequency of an AM or SSB transmitter.

Note that the radio lacks a AGC loop, and that the IF amplifier has a very high gain and is driven into clipping.

To make a good FM receiver a large number of RF amps which are driven into limiting are required to create a receiver which can take advantage of the capture effect, one of the biggest advantages of FM.

NOAA Weather Radio All Hazards transmitters broadcast on one of seven VHF frequencies from 162.400 MHz to 162.550 MHz.

Receivers can be found at many retail outlets, including electronics, department, sporting goods, and boat and marine accessory stores and their catalogs.

Most warnings and watches broadcast over NOAA Weather Radio are county- or independent city-based (parish-based in Louisiana), although in a few areas of the country the alerts are issued for portions of counties.

You're no longer limited to listening in your car: The Sirius Satellite RadioReceiver is a palm-sized portable Sirius satellite tuner that plays 120 channels of satellite radio programming in 13 categories, such as music, news, sports, talk, and entertainment.

The plug-and-play Sirius Satellite RadioReceiver is specifically designed to mount in a vehicle or indoor/outdoor location.

You can program your Sirius Satellite RadioReceiver to shut down after a pre-selected period of time from 15 minutes to one hour.

We’re pleased to announce that the Receiver Shopping List, which for many years was a printed booklet from Radio Netherlands, then a Web feature, has been moved to its new home on the recently relaunched website of the Medium Wave Circle.

Changing editorial priorities and budget cuts meant that Radio Netherlands was unable to continue supporting this feature, and it seemed logical to hand over the material to a hobby club.

Although it is about five years since the last review was written, some of the receivers featured are still available either new or secondhand.

By pulsing the receiver on/off the average supply current may often be reduced by a factor of 20 or more depending upon the system requirements, the data detect output is valid 5ms after application of the supply and is used to inhibit the power saving while data decoding is done.

The data slicer in the receiver module is designed to accept data with a wide range of pulse widths and mark: space ratios.

If you are tuned to a radio station broadcasting an HD signal, the HD Radio™ logo on the front of the receiver will be lit.

It may take a few seconds for the receiver to find and convert the broadcast signals to digital, which is normal.

Connecting the MultiStream™ HD radio to a car or boat stereo requires a 12 v power adapter as well as one of the following: RCA In jacks on the car stereo, OR a cassette player in the car stereo OR a mobile FM transmitter.